Mark ColyvanMark Colyvan is an Australian philosopher and Professor of Philosophy at the University of Sydney. He is a former president of the Australasian Association of Philosophy. Colyvan is known for his research on philosophy of mathematics.BooksThe Indispensability of Mathematics, Oxford University Press, 2001Ecological Orbits: How Planets Move and Populations Grow, Oxford University Press, 2004An Introduction to the Philosophy of Mathematics, Cambridge University Press, 2012